And I was just wondering if anyone has a version of Tarpit Defense that I can edit in the Starcraft Campaign editor, or if you need a different editor to make it in. Whenever I try to open it in Campaign Editor, it says it can't open it and to make sure it's valid. Can somebody please help me? Thanks.

If you're looking for a map, use the File Request Thread. As far as not being able to open the map you do have, most often it is because the maker protected the map. I suggest using Scmdraft 2 for all your map making endeavors, though it won't open a protected map.

Thanks, but is there any way to "un-protect" a map?

There are a bunch of Map making tools here for protection/compression, editing and other miscellaneous utilities that you may want to look at.

Just one thing, if you want to edit Tarpit Defense, please respect the original maker, and leave their name on the map.

That's fine, I don't even know where it is or how to take it off lol